Electric motor.



No. 844,383. PATENTED FEB. 19, 1907. G. R. MBSTON & H. I. PINGH.

ELECTRIC MOTOR. APPLICATION FILED APB.11,1906.

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BLEGTRIG MOTOR.

APPLIOATIOH I'ILED APR. 11. 1906.

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UNITED STATES PATENT CHARLES R. MESTON AND HERBERT I. FINCH, OF ST.LOUIS, MISSOURI,

ASSIGNORS TO THE EMERSON ELECTRIC MANUFACTURING COM- PANY, OF ST. LOUIS,MISSOURI, A CORPORATION OF MISSOURI.

' ELECTRIC MOTOR.

Specification of Letters Patent.

Patented Feb. 19, 1907.

Application filed April 11, 1906. Serial No. 311,187

To all whom it may concern.-

Be it known that we, CHARLEs R. MEs'roN and HERBERT I. Fmon citizens ofthe United States, residing at St. Louis, Missouri, have jointlyinvented a certain new and useful Im rovement in Electric Motors, ofwhich t e following is a full, clear, and exact description, such aswill enable others skilled in the art to which it app'ertains to makeand use the same, reference being had to the accompanying drawings,forming part of this specification, in which Figure 1 is a verticallongitudinal sectional view. Fig. 2 is a vertical cross-sectional viewon the line 2 2 of Fig. 1. Fig. 3 is avertical cross-sectional view onthe line 3 3 of Fig. 1,- and Fi 4 is a diagrammatic view showing the fied-winding, including the startingcoils and their connections to thecontrollerterminals.

This invention relates to a new and useful improvement in electricmotors, particularly alternating-current motors, wherein there areemployed starting-coils through which the current is directed when themotor is started, said coils when the motor attains speed beingautomatically cut out. When the armature attains speed, said armatureautomatically throws lnto operative position a clutch mechanism wherebthe armature becomes coupled to the shaft.

The object of our invention is to providea motor having a simple form ofmechanism for automatically coupling the armature to its shaft andcutting out the starting-coils. By our improved construction thearmature revolves freely on its shaft in attaining speed, and when thedesired speed is attained the starting-coils are cut out and the clutchdevices thrown into operative position, whereby the motor runs as aninduction-motor, and in addition to which the armature is coupled to theshaft by friction devices, whereby if the load is too heavy the couplingwill permit independent rotation of the armature.

In Fi 1 of the accom anying drawings is shown t e framework of analternating-current motor, having omitted the windings of the field andthe details of the armature, the field-winding being showndiagrammatically in Fig. 4.

In the drawings, 1 indicates the armatureshaft, mounted in suitablebearings in the frame of the motor, and 2 the armaturehub, whicharmature-hub carries pins or projections 3, there being preferably threeof said projections mounted on the armaturehub, said armature-hub beingmounted so as to freely rotate on the shaft 1.

4 is a-clutch member in the form of a flanged disk, which is fixed tothe shaft 1. This clutch member carries pins 5, which pass throughelongated slots in contactplates 6. (See Fig. 2.) There are two of thesecontact-plates, oppositely dis osed with respect to each other, theirends eing connected by springs 7, which springs tend to I hold saidplates on the divided contact-ring 8. The two segments of ring 8 areconnected in series with the starting-coils 11 of the motor, and theopening between said segments constitutes a break in the continuity ofthis circuit, which break is closed or completed by the contactlates 6.

12 indicates t e main field-coils, the terminals of which are connectedto the startingcoils, as shown in Fig. 4.

Referring now to Fig. 3, it will be observed that the pins 3 passthrough radial slots in a plurality of sets of weighted clutch members9, connected together by springs 10.

In operation when current is admitted to the motor the plates Bare incontact with the segments 8 of the divided contact-ring, completing thecircuit through the startingcoils, causing them to be energized, andthus considerable torque is'developed in the-motor, so as to cause thearmature to rotate. It will be observed that the startin -coils are cutin by the plates 6 as long as t e shaft 1 and its friction-disk 4 remainstationary.

When the armature attains such speed that centrifugal force will throwthe frictionweights 9 outwardly against the flan e of disk 4, it ismanifest that the disk 4 Wlll be rotated, and with it the shaft 1,providing, of course, that the load on shaft 1 will permit of suchrotation. If the load on shaft 1 is too heavy, the weighted frictiondevices 9 will slip on the flange of disk 4. Rotation bein imparted tothe disk 4 the pins 5 thereof wifi cause the plates 6 to be rotated, andas the springs 7 are so adjusted as to permit these plates 6 to bethrown outwardlv by centrifutor attains speed,

gal force out of contact with the segments 8 It will be obvious that thestarting-coils will thus be automatically cut out when the mo: ermitt'the motor to run at its designed liigh spee in a more economical andelficient manner.

We are aware that minor changes in the construction, arrangement, andcombination of the several parts of our device can be made andsubstituted for those herein shown and described without in the leastdoarti from the nature and principle of our lnvent on.

Havi thus described the invention, what is claims as new, and desired tobe secured by Letters Patent, is-

1. In an electric motor, the combination with an armature-shaft, anarmature loosely mounted on said shaft, devices mounted on said armatureconstituting driving elements of a clutch, a companion clutch memberfixed to the armature-shaft, and contact-making devices carried b thearmature-shaft, sai contact-making evices being in an operative positionwhen said armature-shaft is stationary; substantially as described.

' 2. In an electric motor, the combination with an armature-shaft, of anarmature loosely mounted thereon, centrifugally-opec ated clutch membersoperatively connected to said armature, a companion clutch mernberfixedly mounted on the armature-shaft,

contact-making Ipllates mounted bn said armature-shaft, w chcontact-making plates occup an operative position when the armature-saft is stationary, and means for rendering said contact-making platesinoperative when the armature is rotated; substantially as described.

3. In an electric motor, the combination with an armature-shaft, anarmature loosely mounted thereon, centrifugally operated friction clutchdevices rotatably carried by said armature, a companion clutch memberfixedly mounted on the armature shaft, and centrifugally-o efatedcontact-making plates which, when t e armature-shaft is stationary,complete the circuit through the starting-coils of the motor, and, when.the armature-shaft is rotated, said plates are moved to an inoperativepositionso as to out out said starting coils; substantially asdescribed. V a

4. In an electric motor, the combination with an armature-shaft, anarmature loosely mounted on said shaft, a set of radially-moving platescarried by the armature and constituting the driving element of theclutch, a

companion clutch member fixed to the armature-shaft, and contact-makingdevices carried b the armature-shaft, said contactma evices being in anoperative position w en said armature-shaft is stationary; substantiallyas described.

5. In an electric motor,gthe combination with an armature-shaft, anarmature loosely mounted on said shaft, a set of radiallg-mov lug platesprovided with elongate slots w ic receive pins carried by the armature,said plates constituting the driving element of a clutch, a companionclutch member fixed to the armature-shaft, and contactmaking devicescarried by the armatureshaft, said contact-making devices being in anoperative position when said armature shaft is stationary; substantiallya's described.

6. In an electric motor, the combination with an armature-shaft, anarmature loosely mounted on said shaft, a set of radially-movin platescarried by the armature and constituting the driving element of aclutch, yielding means for holding said plates normally in aninoperative osition, a compan ion clutch member fixed to thearmatureshaft, and contact-making devices carried by the armature-shaft,said contact-making vices being in an operative positionwhen saidarmature-shaft is stationary; substantially as described.

7. In an electric motor, the combination with an armature-shaft, anarmature loosel mounted on said shaft and provided with a plurality ofpins, a radiall movable plate mounted on eachin, said p ates coo cratingto form the driving element of a, c utch, a companion clutch memberfixed to the smetore-shaft, and contact-making device's carriedby thearmature-shaft, said contactmaking devices being in an operativeposition w on sai d armatnre shsft is stationary;

,a companion clutch member fixed to thearmature-shaft, and contact-madevices carried b the. armature-shaft, sai contactma vices being in anoperative position w Zn said armature-shaft is stationary; substan iollyas described.

9. In-anelectficmotoi', the combination with an armature-shaft, anarmature loosely mounted on said shaft, 11 set of radially-moving platescarried bytho armature and con stituting the driving element ofa'clutch, a com 8.111011 on the armature-shaft, radially-movingcootact-making lates mounted on said tore-shaft, w "th oont otmaking'lat'es ocan'operative positionwhen t e armature-shaft is stationary andwhich are ada ted to be rendered ino erative when the armature-shaft isrotated; substantial-1m as dosclibed. h h

10. In an electric motor, the combination with an armatnro-shaft, anarmature loosely mounted on soul short, a set of radially-moving platescarried by the armature and con- IIS clutch member fixedly mounted withan armature-shaft, an armature loosely 1 stituting the driving elementof a clutch, a com anion clutch member fixedly mounted on t earmature-shaft, radially-moving contact-making plates mounted on saidarmature-shaft, and ielding means for holding said contact-mailingplates in an operative position when the armature is stationary, saidplates being adapted to move into an inoperative position when thearmature is rotated; substantially as described.

11. In an electric motor, the combination mounted on said shaft, a setof radially-moving plates carried by the armature and con stituting thedriving element of a clutch, a com anion clutch member fixedly mountedon tlie armature-shaft, pins carried by said E companion clutch member,sets of contactmekm plates provided with elongated slots throng whichsaid pins extend, and yielding means for holding said oontact-makinplates in an operative position when the armature-shaft is stationary,said plates being adapted to move into an inoperative position when thearmature is rotated; substantially as described.

In testimony whereof We hereunto affix our signatures, in the presenceof two Witnesses, this 9th da of A ril, 1906.

C IARL S R. MESTON. HERBERT I. FIN CH. Witnesses:

F. R. CORNWALL, GEORGE BAKEWELL.

